e11sync/app/signup/models.py

import geoip2

from django.db import models
from django.contrib.gis.geoip2 import GeoIP2

class Signup(models.Model):
    email = models.EmailField()
    created_at = models.DateTimeField(auto_now_add = True)
    anonymized_ip = models.GenericIPAddressField()
    user_agent = models.CharField(max_length = 255)

    class Meta:
        constraints = [
            models.UniqueConstraint(name = "unique_email", fields = ["email"]),
        ]

    def __str__(self):
        return self.email

    def _city(self):
        try:
            return GeoIP2().city(self.anonymized_ip)
        except geoip2.errors.AddressNotFoundError:
            return None

    def place_name(self):
        if city := self._city():
            return "{}, {}".format(city["city"], city["country_name"])
        return "??"